The quantum theory of the Big Bang is closely related to the quantum cosmological theory of black holes, the main contribution of Hawking to physics. Time begins at the Big Bang as it also disappears in black holes. Quantum theory on the origin of the Universe led to an unexpected quantum theory on the origin of time. The discovery of Hawking and his PhD student was a total surprise. The main hypothesis of their work is that physics laws evolve with time, at least during the very first moment of the Universe and are not transcendant and immutable at the scale of the birth of our Universe as supposed by the theories of Newton and Einstein. The thesis of the cosmological theory Hawking developed with his PhD student is that the origin of time is the Big Bang and that the laws of physics do not precede the Big Bang, but were born with the Big Bang. This book was written by Thomas Hertog at the request of Stephen Hawking at the end of his life in order to popularize the cosmological theory that they developed together. He was a key collaborator of Professor Stephen Hawking. Thomas Hertog is a Belgian cosmologist working at KU Leuven university. On the Origin of Time is a 2023 book by physicist Thomas Hertog about the theories of Stephen Hawking.

Roger penrose and stephen hawking